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net/http: detect Comcast et al DNS and auto-skip DNS tests
Adds helper function to auto-skip tests when DNS returns a successful response for a domain known not to exist. The error from `net.LookupHost` is intentionally ignored because the DNS tests will fail anyway if there are issues unrelated to NXDOMAIN responses. Fixes #17884 Change-Id: I729391bd702218507561818668f791331295299e Reviewed-on: https://go-review.googlesource.com/34516 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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